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Numerical Aerodynamic Analysis of a New Twin Engine Commuter Aircraft Longitudinal and Lateral-Directional Derivatives [Nicolosi Fabrizio, Corcione Salvatore, Della Vecchia Pierluigi, Agostino De Marco] Abstract — This paper deals with numerical investigation preliminary design phase and aerodynamic analysis have been about both longitudinal and lateral-directional static shown by authors in previous scientific articles [1-3]. Fig. 1 aerodynamic characteristics of a new twin-engine commuter shows the aircraft three views. P2012 has a straight tapered aircraft with eleven seats, Tecnam P2012. Numerical analyses wing with surface of about 25 square meters and a wing span have been performed on complete and many partial aircraft of about 14 meters. Two quasi symmetrical nacelles are configurations in order to evaluate the contribution of each installed on wing and two winglets are mounted at wing tip. aircraft component and to estimate their mutual interferences. Slender fuselage geometry of about 12 meters can The analyses have been conducted at wind tunnel Reynolds accommodate up to 11 occupants (2 pilots plus 9 passengers) number in order to provide a validation of the numerical with an higher fineness ratio for the aircraft category equal to investigation. Finally numerical analyses have been also l /d = 7.24. P2012 main geometrical dimensions are performed at free flight conditions, in order to have an estimation F F of the Reynolds number effect in especially on the aircraft base summarized in Table I. Conventional horizontal body mounted drag coefficient and on the wing span loads in both flap up and tail plane has been adopted with a horn balanced elevator flap down conditions. movable surface and 30 degrees sweep vertical tail plane with dorsal fin has been designed with a high control power rudder Keywords—CFD, Longitudinal and Lateral-Directional surface. The research group has performed in the past Stability, CommuterAaircfrat extensive activities on light and general aviation aircraft, acquiring experience in the analysis, aerodynamic design and flight testing of this particular aircraft category. I. Introduction Since 2011 Tecnam Aircraft Industries TABLE I. P2012 MAIN GEOMETRICAL CHARACTERISTICS (http://www.tecnam.com/Default.aspx) and researchers at DII (Department of the Industrial Engineering of the University of Symbol Value Naples) are deeply involved in the design of a new 11 seats SW 25.40 m2 (268.2 ft2) commuter aircraft, the P2012 Traveller. Design guidelines, bW 14.00 m (45.9 ft) AR 7.72 specific market opportunities, numerical aerodynamic analysis W c 1.87 m (6.14 ft) and wind-tunnel tests have been outlined by the authors in λW 0.73 previous works [1-3]. The authors at DII have matured lF 11.59 m (38.0 ft) experience in aerodynamic design [4] and flight tests of light hF 1.60 m (5.3 ft) aircraft [5, 6] and many research activities have been dF 1.60 m (5.3 ft) performed in collaboration with Tecnam. Nicolosi Fabrizio, Corcione Salvatore, Della Vecchia Pierluigi, Agostino De Marco Department of Industrial Engineering/University of Naples Federico II Italy [email protected] [email protected] [email protected] [email protected] II. The P2012 Traveller The Tecnam P2012 Traveller is a twin engine, 11 seats, Figure 1. P2012 Traveller, three views (CAD) high-wing and body mounted horizontal tail aircraft. Design specifications have led to a fixed landing gear, high cabin volume and short take-off and landing distances. The aircraft III. Mesh and physics setup is powered by two Lycoming piston TEO-540-A1A engines. Aerodynamic analyses have been fulfilled through the The aircraft will be used both as a passenger airplane but it has software STAR-CCM+ [7]. The software includes all the been designed to be a very versatile and flexible aerial required features from the pre-processing, to the post- platform, offering multi-role opportunities. More details about processing and data analyses tools. The whole simulation 1 .

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